Shifting-eccentric.



No. 883,031. 4 PATENTED MAR. 24, 19087' i H. LENTZ n C. BBLLBNS.

,SHIFTING ECGPNTRIC.y AIPLIOATIQN FILED ARB. R8. 1908.

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, l z v Nq. 883,031. PATENTED MAR. 274, 190s.

H. LBNTZ a; o. BELLENS.

SHIFTING EGGBNTRIG. APPLICATION 11.21: Arn.za.,1soe.

'UNITED STATES PATENT OFFICE.

HUGO LENTZ, OF HALENSEE, NEAR BERLIN, GERMANY, AND CHARLES BELLENS,OOFNEUILLY-SUR-SEINE, FRANCE.

SHIFTING ECCEN'IRIC.

Speccation of Letters Patent.

Patented March 24, 1908.

Applcationled. April 28, 1906.2?. Serial No. 314,125.

T 0 all whom it may concern:

Be it known that we, HUGO LENTZ, a subject of the German Empire, andresident of 123 Kurfrstendamm, Halensee, near Berlin, in the Empire ol`Germany, engineer, and CHARLES BELLnNs, a subject ot the Kingdom olIGreat Britain, residing 43 Rue de Chzy, Neuilly-sur-Seine, in theRepublic of France, have invented certain new and useful lmprovements inShilting` Eccentrics, of which the following is a specification.

This invention has for its object a means for eil'ecting thedisplacement of machine parts by the direct contact of membersappropriately toothed or screw threaded. It is known that when two rackswith teeth arrange d obliquely to their length are in engagement, themovement oi' translation imparted to one of them may be directlyTtransformed into a movement o" translation of the other.

The invention consists in the application of this method of transmission'for producing a displacement of parts such 'for example as thesl'iea'ls oi distributing eccentrics, the 'fra-mes of machine tools andso forth.

ln the accompanying drawings which rep resent by way of example theapplication ol the invention to steam locomotives; .Figure 1 illustratesa plan view oll an apparatus mounted upon the counter shaft of a locomotive for producing` the change of position of the eccentric sheaf. Fig..2 is a diagrammatic side elevation of a locomotive showing theapplication of this type of transmission and its controlling meansarranged for the displacement of the distributing eccentric at varyingangles. Fig. 3 shows a longitudinal vertical section of the apparatus.Figs. 4 and 5 are cross sections on the lines 4-4 and 5-5, respectively,in Fig. 3.

The transmission gear is obtained by mounting upon a common support thepart or various parts which are to be displaced, with which support theyare in direct engagement by means of oblique teeth or ribs; alongitudinal movement of translation is given this support by means ofan operating rod or bar displaceable in the direction of its length'orrotatable around its axis.

ln Fig. 2- the application of the invention to a locomotive isillustrated; for this purpose a transmission gear is provided and at anappropriate place directly upon the driving axle or indirectly byconnectingit with `rection of its length.

this axle and the operating rod which is connected with operating partsWithin reach of the driver.

1 is the lever of the valve, 2 the eccentric rod1 3 the eccentricand themechanism as a whole, 4 the reversing rod and 5 the operating lever. Theconnection between the operating bar 4 and the mechanism for the angulardisplacement of the eccentric is represented in detail in Fig. 3. Thestud 6 of the counter crank 7 carries a sleeve S caused to participatein the movement ot rotation of the stud 6 by a groove and feather 9.This sleeve 8 is adjusted upon the stud 6 in such a manner as to becapable ol" sliding in the dilts external 'lorm corresponds to a recessof the same form made in the eccentric shear 10 which has oblique teethor ribs in direct engagement with the sleeve S by means of'corresponding oblique teeth or ribs 11. It terminates in a cylindricalpart 12 in which there is 'formed circular non-inclined. grooves 1.3intended tor the reception of ribs on a second sleeve 14 which catchessleeve 8 and slides with it along the stud 6. The grooves 13 thereforerender the sleeves 8 12 and 14 solid in their longitudinal displacementwhile a't the same time leaving them independent as regards theirmovements of rotation around the stud 6. The sleeve 14 is provided withoblique teeth or ribs 15 in direct engagement with teeth 16 of similarform upon the reversing bar 4. This mechanism or kinematic combinationis surrounded as a whole by a box or casing 17 which serves as a guideand support for it.

The operation is as follows-In running, the sleeve S-1 2, and theeccentric sheaf 10 participate in the rotation of the stud 6 the sleeve14 and the casing 17 however do not rotate with the other arts of themechanism. When the driver disp aces the bar 4 longitudinally in eitherdirection the ribs 16 engaging the ribs 15 produce a longitudinaldisplacement of the sleeve 14 on the stud 6 in which movement the sleeve8 partici ates owing to the non-inclined grooves 13 anc ribs 12, saidsleeve during this time, continuing to rotate with the stud 6 and theeccentric sheaf. The longitudinal displacement of the sleeve 8-12 causesthe eccentric sheaf to slide in its plane by means of the oblique ribs11, this resulting in an alteration of the distribution in the cylindersand eventually in the reversal of the running of the engine.

As l draulic machines, air compressor pumps, gas

the sleeve 14 does not participate in the I motors, machine tools and solorth.

movements of rotation of the crank stud 6, it will be understood thatlthe bar l is able to assume various inclinations relatively to theeccentric rod 2 without influencing the operation of the mechanism. Itfollows from this that the operation of the mechanism and consequentlythat of the valve gear is not influenced by the rise and fall of theframe of the locomotive.

rlhe transmission of the movement between the operating bar 4 and thesleeve instead of being effected by means of a translation of this barmay be produced by giving it a movement of rotation. and the sleeve maybe acted upon by this bar either directly or by the intermediary ofappropriate parts (not shown).

On a locomotive, as in Fig. 2, the driver produces the rotation of theoperating bar 4 by means of a hand wheel and of a shalt connected to theoperating bar 4 by an appropriate bevel gearing, Cardan joint or othersuitable means.

In the foregoing description it has been assumed that the mechanism hasbeen mounted upon a counter crank and in line with the motor axle,obviously it might be mounted upon this motor axle itself, between thewheels or outside the wheels and be placed directly upon the axle orindirectly.

The means described considerably simplilies valve gear and in particularreversing gears onlocomotives. The mechanism represented in Fig. 3comprises an almost closed casing or box thereby rendering appropriatelubrication of 'all the parts possible, particularly the eccentric oreccentrics and also protects the parts from dust or at all eventspermits ol" eliminating the dust from them.

The invention is applicable not only to locomotives but also to allengines and in particular to steam engines, locomobiles, hy-

Having now particularly described and ascertained the nature of our saidinvention and in what manner the same is to be performed, we declarethat what we claim is:

l. ln a shitting eccentric, the combination with a crank stud, of asleeve rotatable with the stud but not relatively thereto, and adaptedto slide longitudinally on the stud, said sleeve being provided with twosets of ribs, one set inclined and the other circular, an eccentricprovided internally with inclined grooves meshing with the inclined ribsoi thesleeve so as to be displaceable in its plane, a sleeve slidable onthe stud but not rotatable therewith, said sleeve being provided withcircular grooves meshing with the circular ribs of the first namedsleeve, and with inclined ribs, an operating rod having inclined ribsmeshing with the inclined ribs or' the sleeve, operating levers fordisplacing the rod, and a casing supportingtthe eccentric and the wholemechanism.

2. Ina shifting eccentric, the combination of a crank stud, a sleevemounted to slide on and turn with the stud and provided with inclinedribs, an eccentric provided with inclined grooves receiving the ribso'lE the sleeve, a second sleeve mounted on the crank stud and connectedwith the lirst sleeve to slide but not to turn therewith, said secondsleeve being providedv with inclined ribs, and an operating rod havinginclined ribs meshing with the inclined ribs of said second sleeve.

In testimony of which we have hereunto placed our hands and seals atMilan, Italy this twelfth day of April, 1906.

HUGO LENTZ. [1.. 5.] CHARLES BELLENS. [n s] ln the presence oli-INGBARTO BARLONY, ERNESTO SANTI.

